Enthaler kesselschmiede



.To aZZ whom it may concern:

OSKAR ELBERLING, OF FRANKENTHAL GERMANY, ASSIGNOR TO FRANK- ENTHALERKESSELSOHMIEDE, VELTHUYSEN &;CO., OF SAME PLACE.

, MUE F COVEIING SURFCES @F ETAL llTi-i LEAD SPECIFICATION forming partof Letters Patenthlo. 395,269, dated December 25, 1888. Applicationfiled October 4, 1888. Serial No. 287,233. (No specimens.) Patented inGermany August 8, 1886, No. 38,897.

Be it. known that I, OSKAR ELBERLING, a subject of the Emperor ofGermany, and a resident at Frankenthal, Germany, assignor to the firm ofFRANKENTHALER KnssnL SCHMIEDE, VELTHUYSEN & 00., of Frankenthal, haveinvented new and useful Improvements in Covering Metallic Surfaces withLead, of which the following is a specification. r This inventionrelates to an improved process of covering metallic articles, especiallythose of iron, with lead. The surface of the article to be C(Wflld withlead is carefully cleaned in order to remove any oxide, dirt, and thelike, (preferably by using steel brushes,) roughened by means of asand-j et blower or the like, washed over with soldering-liquid, andthen immersed in a hot-lead bath.

consequence of the brushing, and must be, covered by a second operationwith a layerl of lead which shall be of the desired thick ness. Thelayer applied to the article in this second operation is Welded orsecured in a homogeneous manner upon the article previously covered withlead. For this purpose the article inthe case of plane surfacesforexample, sheets or plates of iron-is placed "horizontally upon asuitablesupport, washed While the article is in the lead bath thesurface to be covered with vents the lead from passing over the edges ofthe latter and determines the thickness of the lead. After this thewhole is again heated to a temperature above the melting-point of thelead for a longer or shorter time, according to the thickness of thearticle to be covered with lead. It is again treated with steel brushes.in order toobtain an intimate connection of the leaded sheet or platewith the layer of lead to be applied to it, and is then allowed to cool,care'being taken that during 'and filling up the space between the walland the core or casing with lead; then heating it again to a temperatureabove the meltingpoint of the lead and carefully cooling it, freshliquid lead being added from time to time. I a

The surfaces of articles treated in this manner present'quite ahomogeneous cover that is free from blisters and firmly adheres to thearticle.

Having thus described my invention and the manner of employing the same,what I .claim as my inventiomiand wish to have socured to me by LettersPatent of the United States of America, is-

The herein-described process of coating articles of metal with lead, thesame consisting in cleanin the surface of the article, then roughing thesame, washing it with solderingliquid, placing it in a bath of meltedlead and at the same time treating the surface with stilf brushes,removing it from the bath, and after cooling Washing itwith'soldering-liquid, heating it to about 400 centigrade, applying toand confining on the surface a layer of melted lead of a certainthickness,'then heating it to a temperature above the meltingpoint oflead, and finally cooling it, substantially as set forth.

In testimonywhereof l have signed my name to this specification in thepresence of two subscribing witnesses.

, OSKAR ELBERLING. Witnesses: E. D. OOWEN,

J. L. SCLANDERS.

